Question

please answer this question I could be grateful​

Answer 1

Answer:

1. answer =Air is a general for a mixture of gases that make up the Earth atmosphere.

Nitrogen = 78% oxygen = 21% and carbon dioxide =1%

2. answer = the mixture of gases that surrounds the earth or many other star,planets etc.

3.answer Helium, neon, argon, and radon.

• 4.answer 1 plastic and textiles 2. oxygen therapy 3. brazing welding and cutting of steel